Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39890d9f66c8bd6a23206bdfd993ad7cfc5aa77bb09f84de008cb1131217ec03' 
  AND token = '1Z6nQRLIhztb1Nk3lEHySE2HGuJQ2AdKzfoMHo330Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}